Firewall panels and engine bay bulkheads can subtly transmit vibration into the cabin, affecting midbass and overall tonal clarity. SoundSkins Global Classic is engineered to add dense damping to these structural surfaces, reducing flex caused by engine movement, road vibrations, and low-frequency speaker output. Installing Classic sheets across the firewall stabilizes the metal and limits resonance, preventing unwanted energy from interfering with speaker performance inside the cabin. This treatment also minimizes rattles and vibration transfer through surrounding trim panels, creating a more controlled acoustic environment for both front and rear passengers. By reinforcing this often-overlooked barrier, SoundSkins Classic allows factory and aftermarket audio systems to deliver tighter low-end response, clearer midrange, and more accurate stereo imaging. The result is a cleaner, more immersive listening experience without requiring changes to speaker placement, amplifier settings, or enclosure design. Treating firewall panels with SoundSkins Classic ensures every note is reproduced with greater precision, giving the cabin a balanced, high-fidelity sound profile.